TTN5 GPS.CAB Purpose?

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I normally install TomTom 5 by copying the Cab files to the PDA and then tapping on the ones I want to install.

I have an aversion to installing software that I don't use so I usually only install the TTN.CAB file.
I don't use the functions that are provided by WZD.CAB or PIMAddin.CAB so these don't get installed.

The problem is with GPS.CAB, I have tried installing this but cannot detect any difference whether it is installed or not. It must do something but I can't see the need for it.

Could someone please explain what the function of this is and is there any good reason to install it?

Regards

Roger

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